let Buer:boolean=false;
console.log(Buer);//布尔值

let aa:number=9;
console.log(aa);//数字

let b:string='999'
console.log(b);//字符串

let arr:number[]=[1,2,3];
console.log(arr);//數組

let arr1:[string,number];
arr1=['hello',2]
console.log(arr1);//元组

let fun1=(a:number,b:number):number=>{
    let bb=a+b;
    return bb
}
console.log(fun1(1,5),'1,2,3');//约束函数返回值